More headaches for the Socceroos with Borussia Dortmund’s Aussie goalkeeper Mitch Langerak unavailable for tonight’s (Sat) DFB-Pokal final due to a knee injury, reports Goal.com.

"There is a slight stretch. In the period from Tuesday evening until today [Friday] it has not been possible to get him fit for the final."

The Australian international has played in three of Dortmund's five games in the Cup this season, but will miss the showpiece clash against Bayern Munich.

Langerak has been named in the Socceroos' provisional 30-man squad for the FIFA World Cup and is tipped to battle for the number one spot with Club Brugge’s Mat Ryan.

Regular goalkeeper Roman Weidenfeller is expected to start, while Zlatan Alomerovic will deputise for Langerak on the bench.

The Socceroos have had a catalogue of injuries in recent times. Mile Jedinak picked up a groin injury in the final EPL game of the season while Curtis Good is slowly recovering from a hip flexor problem.

And both Rhys Williams and Robbie Kruse were ruled out of the World Cup with serious injuries at the start of the year.